feat: Support for context-free property subscribers

[jlacivita]

Allows a subscriber to be registered for all events, regardless of context parameter value.

For a property with a context parameter, e.g.:

const value = await Module.property(context)

if the x-subscriber-type is set to global in the OpenRPC, then the notification for the property will have no parameters except for the callback:

Module.property( (info) => {
console.dir(info)
})

The info parameter of the callback will have one property for each parameter, and one additional property for the result, based on the param or result's name attribute in the OpenRPC e.g.:

{
  "context": "the value of the context parameter for this notification",
  "result": "the value of the result for this notification"
}

if there is a parameter with the same name as the result, then the value of that property will be the value of the result.

[kschrief]

🎉 This PR is included in version 2.3.0-next.1 🎉

The release is available on:

• npm package (@next dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[kschrief]

🎉 This PR is included in version 2.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀